Upgrade your lawn maintenance with this 16 - pack weed eater string. It features a 0.065 - inch polyamide nylon thread, 30 FT long per piece, offering efficient cutting. The string is abrasion - resistant, with a tensile strength of over 100 lb, 30% more durable than other brands. It's suitable for multiple models like GH400, GH500, etc. The automatic feeding system eliminates the hassle of manual winding. The spools are made of the latest materials to withstand high - speed operation. With 12 spools, 4 spool caps, and 4 springs in the pack, it provides a long - lasting supply for your lawn mowing needs, making your lawn care easier and more convenient.